Steam-generator



(No Model.)

f P. E. HOSMER, STEAM GENERATOR.

ATTOHNE Y.

' UNITED STATES PATENT Ori-rioni FRANCIS E. I-IOSMER, OE BOSTON, MASSACHUSETTS.

STEAM-c EN ERATOR.

SPECIFICATION forming part of Letters Patent No. 484,716, dated October 18, 1892.

Application iiled April 14, 1892. Serial No. 429,096. (No model.) Y

To a/ZZ whom/rit may concern:

Be it known that I, FRANCIS E. HosMER, of Boston, in the county of Suffolk and State of Massach usetts, have invented certain new and useful Improvements in Steam- Generators; and I do hereby declare that the following is a full, clear, and exact description of theinvention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon, which form part of this speciication.

This invention relates to certain improvements in steam-generators.

The object of the invention is to provide an improved steam-generator exceedingly cheap, simple, and durable in construction, and composed of a minimum number of parts to attain the end of producing a maximum quantity of steam with a minimum consumption of fuel.

The particular object of the invention is to produce an improved generator wherein the circulation of water is rapid and almost if not quite perfect.

The invention consists of certain novel features of construction and combinations of parts more particularly pointed out hereinafter, and specifically pointed out in the claim.

The accompanying drawing represents a sectional elevation of the improved generator. In the drawing the reference-letter c, indi cates the outer shell or casing of the boiler, provided with a suitable gage b. This shell or casing is closed at the top andbottom.v

c indicates the inner shell of the boiler, forming, also, the lire-pot and combustionchamber within the tank of the boiler and extending upwardly a suitable distance therein and terminating in the uptake d, extending up through the interior of the boiler and out through the top thereof to convey off the products of combustion.

e indicates the grate at the lower end ofthe fire-box.

f indicates the opening through the boiler into the fire-pot for the introduction of fuel.

g indicates the water-line in the boiler.

h indicates the steam-space at the upper end of the boilers j indicates the feed-water pipe, and i indicates the blow-off pipe.

From the drawing it will be observed that the water in the boiler completely surrounds the fire-pot, except, of course, at the bottom.

7c indicates a series of coils located in the upper part of the tire-pot. Each coil of pipe is preferably independent and the coils of the series are parallel and closely nested, and each coil of pipe extends from the outer edge inwardly and upwardly, so that the coil is i n the form of a truncated cone. Each coil is supplied with water from the lower part of the boiler by a pipe Z, opening into the boiler near the lower end of the boiler and extending upwardly within the fire-pot to the outer loop of the coil. The water then passes in the coil upwardly toward the center of the fire-pot and from the upper end of the coil passes upwardly through vertical pipe m, extendingup through the centers of Ithe series of coils through the lateral bend n above the coils A into the upper portion of the boiler through the inner shell thereof. The Water uptakepipes m from the Various coils are bunched in the open centers of the series of coils,.as shown, and the supply-pipes Z for the series of coils are arranged around the wall of the lire-pot, as shown. The many and great advantages of this arrangement and construction are obvious. The water in the coils is almost instantly vaporized and passes rapidly toward the center of the coils and upwardly at the same time, thereby facilitating the flow thereof, and then upwardly through the pipes m n into the upper portion of the boiler. This action draws the cold water down in the boiler into the pipes Z and then up through the coils.

Great advantages are attained by the peculiar shape and arrangement of each coil and by having each coil provided with a separate inlet and outlet, connecting, respectively, with opposite ends of the boiler, whereby each coil forms a separate circuit through which the water passes from the top of the boiler to the bottom, and then up through the coil and its connecting-pipes.

Great advantages are attained by having the vaporizing pipes or coils connected with opposite ends of a large body of Water in the IOO boiler, so that a free passage is formed for the downward movement of water caused by the flow up through the coils and pipes. The vaporizing coils and pipes are so formed and arranged that the vapor as fast as generated can pass up almost instantly and without retardation, so that the water can pass in immediately and take its place,the object being to create as rapid a flow as possible through or over the heating-surfaces, whereby a maximum generation of steam is produced. Each separate coil is detachably secured within the boiler by means of the unions or couplings ct at the ends of the coils. If any one coil leaks, it can be detached and dropped in the tire-box and repaired.

The various parts and members of this boiler can be readily and easily disconnected for repairs or'interchanging. One great point of advantage in this case is the gradual upward extension of each coil at the same time that it extends inwardly toward the center. By

this peculiar arrangement much desired advantages are attained in the increased and rapid circulation.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

and detachably connected by separate unions with a bend extending into the lower portion ofthe water-space, the inner ends of the coils extending up through the open centers of the coils to the upper end of the combustionchamber and detachabl y connected with bends extending into the wateror steam space by separate unions, as described.

In testimony that I claim the foregoing as my own I affix my signature in presence of two Witnesses.

FRANCIS E. HosMER.

'Witnessesz F. J. BAXTER, C. M. BAXTER. 

